Yanmar 1GM10
 

"Frank Wiewandt" wrote in message ...
- The engine runs very rough at idle. If I open the engine
compartment I can see the engine moving quite a bit and hear a big
"tok" "tok". I was told this was normal, however still concerns me.
Any ideas?

I've got the same engine in my S2. This is normal.

- Also, sometimes, after the engine first starts I can see quite a bit
of oil coming out the exhaust pipe and quite a bit of smoke (dark).
This goes away after a few minutes of operation. Any ideas?

Just before I shut off my engine I rev it up to blow out any yucky stuff.
When I start it up the next time there is usually only a bit of black stuff
comming out with the water & minimal dark smoke. Of course we are talking
about a single cylinder so there will always be some black residue & smoke
out the tailpipe.

- After running the engine for several hours, I notice that my transom
has black oil stains. The boat I have (C&C 27) has the exhaust pipe
coming out the transom a bit above the water line, so I guess any oil
coming out the pipe stays in the whirlpool. Is this normal?

Yep, that's pretty normal. I just try to clean it off when I can.

Good luck,

Frank Wiewandt

Frank:

Which S2 do you have? Mine is the 8.5M. 1981 model.

Yanmar 1GM10
 

Which S2 do you have? Mine is the 8.5M. 1981 model.

I've got a '86 27. Where do you sail? I'm in western Lake Erie.

Frank

Yanmar 1GM10
 

Which S2 do you have? Mine is the 8.5M. 1981 model.

I've got a '86 27. Where do you sail? I'm in western Lake Erie.

Frank

Yanmar 1GM10
 

"Frank Wiewandt" wrote in message ...
Which S2 do you have? Mine is the 8.5M. 1981 model.

I've got a '86 27. Where do you sail? I'm in western Lake Erie.

Frank

I sail out of Carabelle, Fl in Fl panhandle in the Gulf of Mexico

David

Yanmar 1GM10
 

"Frank Wiewandt" wrote in message ...
Which S2 do you have? Mine is the 8.5M. 1981 model.

I've got a '86 27. Where do you sail? I'm in western Lake Erie.

Frank

I sail out of Carabelle, Fl in Fl panhandle in the Gulf of Mexico

David

Yanmar 1GM10
 

"Matt Koch" wrote in
:

For what it's worth, I also have a yanmar single cylinder engine in my
boat, a YSE8.

At idle it is also very rouogh and loud, I also get a little oil
coming out fo rthe wxhasut when its cold and I have the black transom
syndrome. I have had the injector tested and adjusted but still get
the black moustache.


Matt, does it black smoke when you run the throttle up to full? Many small
boat diesels are way overloaded with too much prop. This will manifest
itself worst when you shove the throttle up to full and let it run at full
throttle for a few minutes. Overloaded diesels will not burn all the fuel
oil being poured into them because their overloaded RPM won't come up to
suck in enough air. The results is carbon pouring out the exhaust,
especially at full throttle....

Signs of overload are when it won't come up PAST the instruction manual's
full speed RPM, black smoke gets worse the longer you run it wide open and
it just sounds awful. You can see the same overload when a trucker has his
foot against the firewall in too high a gear with black smoke pouring out
his stack onto the pretty cars.....

The carbon black you see on your hull may be an overloaded diesel at
partial throttle, where the carbon produced isn't bad enough to see.
Running it at full throttle against the stop shouldn't produce excessive
smoke and you should be able to get the RPM up past full specs without
waiting a week.

I've never figured out why boaters are SO enthralled with diesels lugging
along at 1200 RPM that are made for 3600-4000 RPM by the Japanese geniuses.

Larry W4CSC

Yanmar 1GM10
 

"Matt Koch" wrote in
:

For what it's worth, I also have a yanmar single cylinder engine in my
boat, a YSE8.

At idle it is also very rouogh and loud, I also get a little oil
coming out fo rthe wxhasut when its cold and I have the black transom
syndrome. I have had the injector tested and adjusted but still get
the black moustache.


Matt, does it black smoke when you run the throttle up to full? Many small
boat diesels are way overloaded with too much prop. This will manifest
itself worst when you shove the throttle up to full and let it run at full
throttle for a few minutes. Overloaded diesels will not burn all the fuel
oil being poured into them because their overloaded RPM won't come up to
suck in enough air. The results is carbon pouring out the exhaust,
especially at full throttle....

Signs of overload are when it won't come up PAST the instruction manual's
full speed RPM, black smoke gets worse the longer you run it wide open and
it just sounds awful. You can see the same overload when a trucker has his
foot against the firewall in too high a gear with black smoke pouring out
his stack onto the pretty cars.....

The carbon black you see on your hull may be an overloaded diesel at
partial throttle, where the carbon produced isn't bad enough to see.
Running it at full throttle against the stop shouldn't produce excessive
smoke and you should be able to get the RPM up past full specs without
waiting a week.

I've never figured out why boaters are SO enthralled with diesels lugging
along at 1200 RPM that are made for 3600-4000 RPM by the Japanese geniuses.

Larry W4CSC

Yanmar 1GM10
 

I've never figured out why boaters are SO enthralled with diesels lugging
along at 1200 RPM that are made for 3600-4000 RPM by the Japanese
geniuses.

Amen! I was told early on by a diesel mechanic that it was best to run my
little Yanmar diesel at higher rpms. My boat isn't in the water yet but I
think I usually run mine between 3200 & 3400 rpm. That gives me a little
left at the top if/when I need it. I've been doing this for 18 years & I've
had zero problems.

Frank Wiewandt

Yanmar 1GM10
 

I've never figured out why boaters are SO enthralled with diesels lugging
along at 1200 RPM that are made for 3600-4000 RPM by the Japanese
geniuses.

Amen! I was told early on by a diesel mechanic that it was best to run my
little Yanmar diesel at higher rpms. My boat isn't in the water yet but I
think I usually run mine between 3200 & 3400 rpm. That gives me a little
left at the top if/when I need it. I've been doing this for 18 years & I've
had zero problems.

Frank Wiewandt

Yanmar 1GM10
 

"Frank Wiewandt" wrote in
:

I've never figured out why boaters are SO enthralled with diesels
lugging along at 1200 RPM that are made for 3600-4000 RPM by the
Japanese geniuses.

Amen! I was told early on by a diesel mechanic that it was best to run
my little Yanmar diesel at higher rpms. My boat isn't in the water yet
but I think I usually run mine between 3200 & 3400 rpm. That gives me
a little left at the top if/when I need it. I've been doing this for
18 years & I've had zero problems.

Frank Wiewandt




Luggin' a 1GM sure is hard on motor mounts and the hull under them....

I think the prop should be small enough to over-rev the 1GM by 5% without
creating a huge cloud of lampblack.....

A too-big prop isn't going to create more power. Maybe that's what they
think. A 3GM adds more power....(c;

Larry